Once compiled and run, i get 1 node running GNBD and exporting one of
its disks.
3 other nodes are running as client for GNBD, and i mount a GFS on them,
although all 4 nodes participate to a GFS cluster. (standard config :
dlm, cman)

I have tried to loop 100 times over parallel "bonnie++" on the 3 nodes,
with:

bonnie++ -u 0:0 -d /mnt/gfs -x 100

One of the nodes crashed before the end before the 10th loop, with the
following panic: